grammar fix: if/when a renegotiation takeS place

add missing backlinks to ssl(3)

Document SSL_CTX_clear_mode(3) and SSL_clear_mode(3).
From Kurt Roeckx <kurt at roeckx dot be>
via OpenSSL commit 57fd5170 May 13 11:24:11 2018 +0200
which is still under a free license.
While here,

Document SSL_CTX_clear_mode(3) and SSL_clear_mode(3).
From Kurt Roeckx <kurt at roeckx dot be>
via OpenSSL commit 57fd5170 May 13 11:24:11 2018 +0200
which is still under a free license.
While here, polish awkward wording and reduce duplication.

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ssl.h HISTORY up to 0.9.4; researched from OpenSSL git

for pure *_ctrl() wrapper macros, move the reference from ssl(3)
to SSL_CTX_ctrl(3) to make ssl(3) slightly more palatable

Add Copyright and license.
Delete a sentence explaining exploit mitigation countermeasures
that have long been removed.

move manual pages from doc/ to man/ for consistency with other
libraries, in particular considering that there are unrelated
files in doc/; requested by jsing@ and beck@